Treatment of slag for the manufacture of bricks and for other purposes.



n El R. SUTCLIFFE.

TREATMEOTOF SLAG FOR THE MANUFAOTURE OF mOKs ANO FOR OTHER PURPOSES.

APPLCATION FILED AUG.I7, i914.

"aented Feb 15,

am @la n@ Si WMO In van fr fw Ulf-MTE@ EDGAR neuss snronirrs, or Latein ,snc-issus Y TREATMENT 0F SLAG FOEJHE EYENUECT'URE *OF BRKS ANB E623.

d .ii ,67 Application. filed August 17,

To all whom it may eminem Be it known that I, "EDGAR 'Ronse Son orirrrn, a subject ot the King of Great Britain and Ireland. residing at Leigh, Lancashire', England, have invented certain new and useful improvementsin Relating to the Treatment oiilag for the .Manniac` ture ot' Brit-lis and Jfor other ST"urposes, of which the follmving, is a speciiication.

In the manufacture of hrielis Jtroni slag obtained from blast Afurnaces and other sources it is usual to granulatc the slag oy causing it while in a molten or heated condition to pass into runninr noter, whereby it is disintegrated. The disintegrated slag is then drained of water and intimately mixed with slakcd linie, and the mass then pressed or molded into hriclzs.

The invention consists in an improved process of treating slag.y more especf-lly 'tor the inanuiactlu'e of hriclis hut a iphcablo also for other purposes.

According to the invention the particles of. granulated slag are coated with linie hy treatment in a tlck mixture oi? linie and unter which powdered slag niajv he added, Aften draining and stan-:ling to he 1iii-ought into condition for use the may 1oe readil7 iiornied into bricks hy compression, no grinding being needed. The usual treatnientof the dry slag` 'with liine is thus dispensed with.

Many slugs when granulated in water become light and porous and similar in characier to punaise-stone. 'init unlike the latter such slags when.granulated are hrittie and friable so that theiremployment 'in the manufacture of bricks, blocks.. and partitions is hindered; and it diiiicult in the use or' such slags to produce a good strong product which at the saine time retains its lightness.

lt has been found that it' the ,frranuiaticn ot the slag is cli'eccd hv p it in the 'niolten or heated condition into mixture of lime and water, the treated slag is greatly improved in binding qualities and in hardness. Non', according to the present inventioin the slag is granulated directly in 'the mixture oi vlinie hv `which the coatinf of the 'particles ot disintegrated slag is eifected. Similarly. the lQjranulation oi thc slag may which ground or powhreil slag has heen introduced. According to the invention, again,

the linie and water with the granulated slag specification of Letters Patent.

OTHER; EURPOSES.

Fatented Feb, i5, MM@ iai/i. serial un. 557,250. i i

may pass into a sump or reservoir provided ivith an overiiov., Within which sump or reservoir the heavy particles of the slag may sink to the bottoni, while the lighter particles may float and How out through the overflow". B v such niear: the light and heavy particles are simply separated. The heavy particles may he dredged 'from the sunip by ineans or' a conveyer and passed on -to a periorated Wagon and thence into a heap, to drain; While the lighter particles niay he caused 'to lfall into perforated Wagons on the Way from the overlioiv, and thence ne carried to a tip to drain.

rihe invention also comprises the apparatus hereinafter described.

in' carrying the' invention into'eiect, according to one method l may cause the molten slag` to fall into a running,` stream of mixture of one part of linie to tour parts of Water. For this purpose the 'inillr of lime 'thus produced niay be pumped into inclined'troughs into which the nioltenk slag Y is'deli'vered, and the mixture may then pass into Wagons provided ivth'perforated sides from which the excess linie Water and Water n iay drain and be conducted back to a sump or reservoir Containing v the supply. The granulated slag' after having,` been thus partialli7 drained is carried on the Wagons'and duinped in heaps and permitted to stand forV By' a period -i'or example of seven days. this time theslag may then he in a state in which it readily crunihies. .it may then he pressed or molded directly into bricks or blocks which may he hardened in the usual way, hy exposure'to the atmosphere or by treatment with high or low pressure steam or carbonio acid'gas. v

ln carrying the invention into effect accoraling to another method I may grind the linie with a portion of the slag, and with water in a tube mill, by which a liquid slip is produced in the proportion, i'or example,

of .2 ot linie to i of slag-to L of water. This slip Ymay he pumped into a trough into which molten or heated blast furnace slag' is fed. The blast furnace slag may be ledV into this trough troni a hopper or from a trough, and the mixture then passes linto a sunip or reservoir. In this manner the granules of slag are coated with lime and this coating eventually hardens.

The sui'np is provided with an overflow through which the slip and the lighter particles of the slag may pass. Now most slags float in the denser slip and thus be washed i out with the overflow. The heavy particles of the slag may be dredged up from the snmp by means of an elevator, and passed into perforated wagons which may run on to a tip where the mass is dumped into a heap. The lighter particles of slag may pass into perforated Wagons from the overflow,

and thence be passed on to a tip for draming. Itwill be understood that after standing to drain and to be brought into the con,- dition for use the heavy slag may be-molded into ordinary bricks, while the lighter slag L may be formed into light bricks.

The accompanying drawing illustrates diagrammatically a plant or apparatus suitable for carrying out the process of the invention. f

In the drawing, b represents-a tube mill which is fed through the hopper a and in which a portion ofthe slag may be ground with the lime into a slip. A centrifugal pump c is provided by means of which the lime slip is pumped into the steel trough e. The molten or heated slag may pass into the 'trough e from the hopper el. where it is washedand granulated by the lime slip that is discharged into the trough through the pipe L. The lime slip and granulated slag pass into a sump or reservoir f, in which the heavy particles of the slag` tall to the bottom, whence they are lifted by means of an. inclined elevator g. By this means the heavy slag is lifted into-position beyond the sump or reservoir-f and is discharged, for example7 into a trough Z arranged in front of the sump, from which trough it falls into a wagon m provided with perforated sides. The liquid slip and the lighter particles of slag pass through the overlow m into wagons m on the opposite side of 'the' sump from which Wagons the surplus water drains.

Sets of rails 0, o may be arranged alongside the sump or reservoir and may extend beyond for the purpose of carrying the slag vto the tips or heaps.

In a position beside the sump where the wagons mand n are loaded with heavy and light slag respectively, by such means as scoops or shovels a drain may be provided beneath the rails7 into which the greater part of the water may drain, so that the water may be quickly removed and the heaps quickly and effectively drained of the surplus water. A drain may advantageously extend centrally the whole length of the area where the slag is dumped, and branch drains may discharge intothe main drain. Over Vthis area ,a roof or shed may advantageously be erected.

What I claim as my invention and `desire to secure by Letters Patent is l. A process for treating slag, consisting in granulating molten slag, `in a thick mixtur-e of lime and water, draining and drying the mass, and compressing it, substantially as described. y

2. A process for treating slag, consisting in granulating. molten slag in a thick mixture of lime and water, to which slag in a finely divided condition isadded; draining and drying the mass, and compressing it, substantially as described.

3. A process'for treatingslag,rconsistiing in granulating molten slag in a thick mixture of lime and water, separating the lighter from the heavier particles of Athe mass, .and then separately treating lthe masses produced, substantially as described.

in testimony whereoiE I have hereunto signed my name to this specification 1n the presence of two subscribing witnesses.

'EDGAR HOUSE SUTCLFFE. Witnesses:

ROBERT "OWEN HUGHES, SAMUEL GREENBERG. 

